Lens-edging machine



Nov. 13, 11923.

R. SCHUMANN mans EDGING MACHINE Filed March 5. 1921 2 Sheets-Sheet l J72778M f0?" W M R. SCHUMANN LENS EDGING MACHINE Nov. 13, 1923. 3,474,171

Filed March 5. 1921 2 Sheets-Sheet 2 76 1? 16 Q as Parr/14m Len-Patented Nov. 13, 1 923.

i UNITED eereier ROBERT SCHUIVIANIQF, OIE DUSSELDORF, GERMANY:

LENS-EDC-ING MAGHIIIE.

Application filed March 3, 1921.

To all whom it may concern Be it known that 1, ROBERT Sorrmmrm, acitizen oi the German Republic and residing at Dusseldorf, Germany, haveinvented certain new and useful improvements in lidging lVIachines, oiwhich the following is :ispecification.

The present invention has refer enro to im provements in. copying lensedging machines with relative axial reciprocation of the work spindlefor varying the grinding zones, and it relates more particularly toimproved pat tern disc means in association with the work spindle, andin. connection therewith to means for controlling the extent of thereciprocatory displacement of the work spindle with respect to thegrinding tool.

My improved edging machine permits of turning out lenses of varyingshapes and sizes without any interchange of machine parts, simply byshifting the circumfer ontially grooved contact roller to selectivelycoact with any one of aseries of pattern discs and size or the lensesdetermining the shape to be ground. These pattern oiscs form a fixedpart of the machine and are thus not subject to misplacement or loss.The positivecontrol of the. reciprocetions 01": the work spindle: allowsof a. number of lenses being operated on simultaneously without dangerof having the respectively outermost lenses carried beyond the allottedgrinding zone when they would not be acted upon any longer by the tooland. would he apt to be injured on leaving and again on entering thegrinding zone. This control feature also assures an. even wearing downof the grind.- ing tool.

In the accompanying drawing a con structional form of the grindingmachine according'to the present invention isshown by way of example.

Fig. 1 is e side. elevation, Fig. 2 isa. plan, and Fig. 3 is a. frontelevation of the machine. Figs. 4: and" dare sectional views onthelinesA-B and C.-D, respectively. Fig. 6 is an individualpart. Figs. 7and 8 illustrazte a modification ofan individual part.

011 the-bed. 1 is journelled in bearingsfi a. shaft 2 carrying agrinding wheel 4 and a. driving pulley 90. i The bed is provided withprismaticv ways 5', on which is guided it slide 6, having screws 7 andglatesS for securing said slide toits ways. i n this slide 10 isrevolubly and axially shittab-ly Serial No. 449,279.

journalled. To the shaft 10 is fixed ugrooved cem-wheel 13, in whichengages a. pin 14, which projects shittebly through a. slot 63 in a.plate 15. The said plate 15 is fitted to the slide 6 and carries,supported thereon by means of pins 91 a yoke 66, which drawn downwardsby means of a spring 65, whilst :i set-screw 6i, screwed into the top ofthe yoke beers on the plate 15. Thus it possible to determine therelative posi tion between the yoke and the said plate hy means of saidset-screw. lit the one bearing 9 is journelled a bevel-gear at? throughwhich the shaft 10 passes, Which here carries .1 key, by means of whichthe shaft is dogged when the bevel-gear revolves. The bevelgem. t?meshes with another bevel-gear 17 which is attached to the one half of aclutch 52, while the other half of the clutch 52 shitttably fitted onthe shaft 59 of the bevelgesr 47: Into an annular groove in thisclutch-member engages 1 forked lever 58, the shaft of which 56 iscoupled to a lever 57 and turned by means of a. spring fitted to it, insuch a. manner, that the clutchmember 52 tends to engage in theclutchmemher 52. To shaft 59 is fitted a wormwheel 46, in which engagesa. worm 46, which is fitted to the shaft 2.

0n shaft 10 is movably fitted a long; sleeve 11, to which bearings 16,24: are attached by means of brackets 12. In the bearings 16 isrevoluhly journalled a shaft 17, which carries at one end a. plate 18with a. rubber facing 19. To the shaft 17 are further fitted severalpattern disc 32 the circumferential contours of which correspond to thecircum- :terential contours of the lenses to be ground. A. gear-wheel 51fitted to shazft 17 engages in another geanwheel 56 on shaft 10. livehub of the gear-wheel is held in the bore which engages in a. groove 93in the said.

hub. A. screw 87 in the wheel 51 engages in a. longitudinal groove 89 inshaft 17, so that when the said gearwheel revolves, it will carry theshaft with it; To the outer end of shaft 17 is fitted an arm 73, in thebore of which is placed a spring 84, which bears at one end againstcollar 81 on shaft 17; and, at the other end, against a flange of thebore.

Coexielly with theshaft 17's shaiEtQT is journslled in the bearing 24,carrying a plate 25 with a rubber facing 26 at its one end. To thisshaft is fitted ii geai wheel 71, which, by

hub of the gear- Pool . springs 83,

means of a pin the, bore.

a small handwheel 79.

92 is held in a groove 94in the bearing A screw 88 in the hub of thegear wheel engages in a longitudinal groove 90 in shaft '27., and tothe-outer end of the same is'iitted an arm 74, in the bore of whichspring 83 is disposed, which, at one end, bears against a collarBQ onshaft 27, and, at the other end, against a vflange S6 in Also thisgear-wheel 71 meshes with a gear-wheel'iQ on shaft 10.

From the bearings 16 and are branched oil" arms 77 and T8, in which twoshafts 75 and 76 are journalled, of which the ends turned towards eachother are threaded in an opposite sense, and on tiie one end is screweda threaded sleeve 80, which is held between the arms 77 and 78, andwhich is fitted with The outer ends of the shafts 75 and "Z6 are coupledto the arms 73 and Tl.

To the sleeve 11 is fitted an arm 23 carrying a weight 23.

On the slide 6 a shaft 36 is journalled in eyes 37, and on said shaft isfitted a rocker 35, which is forked at its upper end. In this fork a.shaft 3a with a loose roller33 is journalled. The rocker has an arm 39,which bears with a pin 38 against a nut ll) on a screw ll in the slide(5.

To the sleeve 11 is further fitted by means of an car 43 a pin as whichcan engage in a notch l l in a lever 45, which is pivoted on slide 6 andis provided with a handle The sleeve 11 further has a cam 62 on whichthe lever 57 bears.

, The belt 90 will revolve the grinding wheel at a high speed and bymeans of the gears 46, 456 the shaft 59 and the wheels 47, 47 he shaft10 at a slow speed. Tae glass or the glasses to be ground are clampedbetween the plates 18, 25. This clamping is effected by turning thesleeve 80 and thereby moving the shafts 17, 27 apart by aid of arms 73,'Zl, then the glass or the glasses are inserted between them and thesleeve is turned in the opposite sense, so that the rubber pads 19, 26clamp them. The 84; prevent an excessive pressure being exerted, as thearms 73, M will shift on the shafts 17, 27 when the said springs aretightened. During the clamping of the glasses the sleeve 11 and allparts connected to it are held lifted 0d the grinding wheel by means ofthe pin engaging in the notch l l. As soon as, now the handle 4&5 islifted, the notch l4 releases the pin 43 and the weight 23? will pullthe clamped glass against the grinding wheel, against which it, however,

can only hear as far as the roller 33 will admit. Thelatter haspreviously, been shifted so that a templet-disc 3:2 bears against it,which corresponds in form to the shape the glass is to receive. Theroller will thus hold the glasscarrier in such a position that the glasswill recedefrom the grinding wheel the grinding wheel provisionaccording to the shape of the tei'nplet-disc. The glass will, therefore,be groundto correspondto the said teinplet-dise. -11). order that theglass does not wear any grooves into has been made for the glass totravel across the face of said wheel, the cam-sleeve l3 shifting the pinThe travel of this pin is limited. by the yoke (56. As soon as,therefore, the pin abuts against theone side of the yoke,'th e cam wheel13 will, on revolving shift its position, and the shaft 10 with sleeve11 and its parts,

thus also theglass with, it. By vertically yokei'ce by means of thespring displacing the he available length 35 and the set-screw (3+1: ofthe slot is varied' If the available length of the slot is equal'to orgreater than the whole stroke of the cam-wheel, onlythe pin 14;, and notthe shaft 10 will shi The more, therefore the y olieis lifted, theshorter will be the available length of the slot 63 and the greater willbe the displacement of the shaft 10. The more glasses are ground at onetime, the smaller the displacement of the shaft 10 will have to be. Whenthe grinding operation has been completed the shafts 17, 27 "with theother parts are turned off, until pin e13 engagesin notch a l. Therebythe cam 62 turns the lever 57, which effects the release of theshiftable clutch-member 52.

In the modification according to Figs. 7 and 8 a lever 68 ishorizontally disposed on the slide 6, and carries a pin 1%. On the slide6 is fitted a smaller slide 70, which has an angular groove 71, intowhich the pin 14: engages. The slide may be shifted by means of a screw69. According to the position of the slide 70, thus also of the groove71 to the pin 14, the lateral play of thelatter will be limited. Theresult is, thus, the same as described above.

I claim:

1. In a lens edging" machine of the character set forth, in combinationwith a stationary rotatable grinding tool, a

support, a slide mounted on said support rocating saidcarriage to carrysaid work rotatable" shaft spindles jointly in the same sense-across theedge face of said grinding tool, and means for controlling the extent ofsuch reciprocation of said carriage. g Y

2. In a lens edging machine. of the character set forth, incom'binationwith a.

stationary rotatable grinding tool, work clamping means including adriven shaft,

means ior imparting relative lateral reciprocation between said grindingtool and said work clamping means and means for controlling theamplitude of such reciprocation to keep it within the operative width ofthe grinding tool, comprising a grooved cam disc fixed on said drivenshaft, a fixed bearing member presenting a trans verse slot, avertically adjustable yoke presenting a substantially triangular cutout,and means altering the position of said yoke relative to said bearingmember for controlling; the operative length of said transverse slot,and a pin slidably mounted.

within said slot and its free end extending into the groove of said camdisc.

In a lens edging machine of the character set forth, in combination, arotatable grinding tool, a relatively reciprocable and tiltable worksupport, including a work spindle, a series of pattern discs fixed onsaid Work spindle, means normally holding said work spindle in operativeposition, means for temporarily retaining said work spindle ininoperative position, a contact roller adapted to be brought intoselected cooperation with any one of said pattern discs, means forkeeping said roller in operative contact with the selected pattern disc,and means for causing said contact roller to partake of thereciprocation" of said work support.

a. In a lens edging machine of the character set forth, a work clampinginstrumentality, comprising two axially alined wor: splndles, means forrotating these spindles in unison, means for axially (he- 7 placing saidspindles in opposite directions,

comprising for each spindle an arm journaling the outer end of therespective spindle and the other arm end fixed to a screw spindleextending parallel to the work spindle and presenting an outer thread,the outer threads of said two screw spindles running in ppositedirections, a sleeve presenting corresponding right and left innerthreads adapted for cooperation with said screw spindle threads, andmeans for rotating said sleeve in opposite directions; and cushioninmeans interposed between the outer ends or said WOlC spindles and therespective journal ends of said arms.

In testimony whereof I affix my signature.

ROBERT SCHUMANN.

